diff --git a/src/ol/geom/flat/contains.js b/src/ol/geom/flat/contains.js
index 862594d16e..3e7cfea7a0 100644
--- a/src/ol/geom/flat/contains.js
+++ b/src/ol/geom/flat/contains.js
@@ -1,5 +1,6 @@
 goog.provide('ol.geom.flat.contains');
 
+goog.require('ol');
 goog.require('ol.extent');